Discord message

I just started playing poe2 and with a lot of struggle I managed to get to (what I think is ) end of act 2.
I choose the witch lich. So far I haven't had many issues just a lot of confusion. Now it seems I hit a wall with this boss and I can't figure out what to do to improve my damange. I have some lvl 9 skills with some support gems but honestly I have done everything as I thought it would make sense but no idea if that even makes sense anymore. I used some orb on some object and tried to buy new weap from the vendor. I really don't understand what should make me more powerful since a lot of item look better but then the modifiers are better from the old piece so I'm never sure.

I guess the main question is, is there a good soul willing to hold my hand a little bit, I can provide screenshot of what I currently have and the items I have/can get. I know it's a big ask but I have been smashing my head against this for the past 6 hours and the more things I change the worst it gets. Any help/advice is really appreciated.